@article{IM_1991__106_1_143953,
     author = {Fernando Rodriguez Villegas},
     title = {On the square root of special values of certain {L-series.}},
     journal = {Inventiones mathematicae},
     pages = {549--574},
     publisher = {mathdoc},
     volume = {106},
     number = {1},
     year = {1991},
     zbl = {0773.11034},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__106_1_143953/}
}